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Vertical wall application without extra bitumen glue can cause peel off shingles especially with lack of ventilation and movement of the wooden deck!
Accessoires
Everything you need to finish your shingle roof
1. Algae growth
Blue, green or black stains on a bitumen shingle roof are mostly caused by algae. These algae staining begins with small spots. Over time these spots can develop into streaks. Algae stains are often mistaken for mold or mildew. Algae may hurt the appearance of your shingles roof, but other than that it is not harmful at all.
Tubular skylights
Roof window
